针对差动线圈，检测管子上不同埋藏深度缺陷的模型进行数值计算，得到对应的阻抗平面图。
The impedance diagrams using differential coils to test the tube with different defects are numerically calculated .
一个直线差动变压器有三个线圈。
结合高压输电线的特点，在论述了电涡流检测方法的基本原理之后，进一步论述了差动式检测线圈的电涡流检测原理与方法。
Taking into account the characteristic of the high-voltage transmission line, this paper discusses the basic principle of the eddy current testing method.
结合高压输电线的特点，在论述了电涡流检测方法的基本原理之后，进一步论述了差动式检测线圈的电涡流检测原理与方法。
Taking into account the characteristic of the high-voltage transmission line, this paper discusses the basic principle of the eddy current testing method.
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